 Okay. So this problem was on the quiz. Calculate the mass in grams of 4 potassium atoms. So obviously you've got to know that potassium is K, okay? What's the atomic weight of potassium? That's the next thing you need to know. It's 39.10, okay? We can approximate it like that. Yeah. Well, we'll see. We'll see what happens, okay? So if we want to know the mass of 1 potassium atom, oh, sorry. The other thing we know is 1.66 times 10 to the negative 24 grams equals 1 K mu. So the mass of 1 potassium atom is 39.10 AMU. So the mass of 4 potassium atoms is going to be 4 times that number, right? 4, so the mass is going to be 4 times 39.10 AMU. 1.56.4. What is it? It's 1.56.4. 1.56.4 AMU, okay? But that's an AMU, and we want it in grams, okay? So we know this conversion factor here, right? 1.66 times 10 to the negative 24 grams is 1 AMU. AMUs cancel now? 9.10 times 1.66. So it's going to be a very small number as you should expect, 2.60 times 10 to the negative 22nd grams. Well, on this one, 4, that's an infinite number of 6, okay? So any amount of 6 things that you put on this, I would have accepted. Okay. So you could have put 2.596 if you wanted to, or, you know. I'm just coming out of something kind of.